Turbine-nozzle.



UNITED "PATENT OFFICE.

THOMAS BELL, OF CLYDEB ANK, SCOTLAND, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK. 1

TURBINE-NOZZLE.

Specification of Letters Patent.

Application filed-April 15, 1910. Serial No. 555,755.

To all whom it may concern:

Be it known that I, THOMAS Benn, a subject of the King of Great Britain. residing at Clrtlchank, county of Dumbarton, North Britain, have invented certain new and useful Improvements in Securing 'lurbine-Nozzles to Supports, of which the following is a specification. I

This invention relates to elastic-fluid turbines and especially of the. multistage type, and its object is to provide simple and ctl'eclive means-for securing the nozzles to the diaphragms or other supports in such 1nanncr that they cannot work loose and darn ige the moving parts of the turbine.

The invention is applicable to any type of impulse turbine in which the energy of the steam is fractionally abst raeted by a plurality ofstages, .each receiving the steam from the )receding stage through a set of nozzles located in openings in the diaphragm or The partitions separating the two stages.

number of nozzles secured to each dia-- phragm varies according to the volume of fluid to be'handled and on the degree of expansion inthe corresponding stage. The nozzles may have their walls either diverging or non-diverging, as conditions may require. They are preferably formed in groups, each group being handled as an entity. For convenience, such a group willbe hereinafter termed a nozzle, and it is secured to the diaphra m by engaging its' beveled edges with unc ercut grooves on the diaphragm, as hereinafter more fully set for h.

In the accompanying drawing, Fi ure 1 is a view in elevation of a diap ragm equipped with two nozzles; Fig. 2 is a sec tionon the line 22, Fig. 1; and Fig. 3 is a. section on the line 33, Fig. '1, the two latter figures bein 'on a larger scale than Fig. 1 and Fig. 3 rowing also a portion of the casing of the turbine.

The diaphragm, partition or other support 1 is provided with the requisite num- )(l of openings 2. one for each nozzle 3,-

which is made with a flange l bearing on one face of the diaphragm around the opening 2. The nozzle projects through the opening, which is of greater width radially than said nozzle, its sides and ends hciu I of a contour to suit. the external contour o i the nozzle. The ends and inner edge of the tlangoarc lwvclcd, as indicated at. .1, and

out groove (3 to fit. said bevel. A bead/7 may be provided on the diaphragm to partly or wholly contain the undercut groove, if desired, and the head and groove are extended to the radial rib 8 between the openings The greater radial \\'l(lt'li 1lf the opening 2- Patented Nov. 1, 19 10.

the diaphragm is provided with an undertapped holes formed for them in the dia-- phragm near its outer edge. The periphery of the diaphragn'i is stepped, as shown at, 10 and 11, Fig. 3. and counterpart stepped surfaces or shoulders 12, 13 are formed on the-inner surface of the casing 14. There isalso provided on the inner surface of the turbine casing an inwardly projecting flange 15 forming with the shoulder 13 arecess ofa width to receive the cir 'uinferential flange on the diaphragm formed by the stepped portion 11. and also-the-outer edge of the flange 4 on the nozzle. The. flange 15 also covers more or less of the heads of the screws 9, if used, so thatthere 1:; no danger of their working' loose and falling into the interiorof the turbine and damaging the bucket wheels.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof;

but I desire tohave it understood that the apparatus 'shown is only illustrative, and hat the invention can be carried out by other means.

that I claim as new and desire .to secure by Letters Patentof the UnitedStates, is,- 1. In a turbine, the combination with a nozzle, of a support containing a nozzle- -receiving opening which is of reater width radially than said nozzle, and is provided with an undercut. groove for an edge of said nozzle. v

2. In a turbine, the combination with a nozzle, of a support containing'a nozzlereceiving opening which is of greater width radially than said nozzlc,'and a'hcad along the ends and one side of said openin containing'an undercut groove for an e ge of said nozzle.

3. In a turbine, the combination with a nozzle provided with a flange having a beveled edge, of a su port containing an opening for said nozz e, and a bead adjacent to said opening having an undercut groove for an ed e of said flange.

4. I n a turbine, the combination with a nozzle provided with a flange having a beveled edge, of a support containing an opening for said nozzle, a bead adjacent to said ogenin having an undercut groove for an e ge 0 said flange, and means for retaining said flange engaged with said groove.

5. In a turbine, the combination with a nozzle provided with a flange having a beveled edge, of a diaphragm containing a nozreater radial width than said nozzle an an undercut groove along the ends and one side of said openingto receive an ed e of said flange, and serewspassing throng said flange into said diaphragm along the other side of said opening.

In witness whereof, I have hereunto set my hand this twenty fourth day of March, 1910.

' THOMAS BELL.

\Vitnessesf I CHARLES P. LEIPER, J. B. Hnnnnnson- 

